RNAO70X90X30-XL bearing: complete specifications & equivalents

Specification table

Source: catalog reference (HR1 2026-09-25) · extracted 2026-09-30

Parameters extracted from the official FAG Rolling Bearings catalogue (HR1 2026-09-25); FAG® is a trademark of Schaeffler Technologies AG & Co. KG, used here for identification only — mpnbase is not an authorized FAG/Schaeffler distributor. Boundary dimensions are ISO 15 interchangeable; current production values may differ, verify at schaeffler.com.

Cross references & equivalents

Interchange levels: full standard interchange · partial verify parameters · verify manual confirmation required. Links resolve to the equivalent model's specification page where available.

How the RNAO70X90X30-XL model number is decoded

envelope 70×90×30 mm: 70 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 10.0 mm radial section packed with small-diameter needle rollers C is 68 kN and C0 135 kN at the 70 mm seat; the C/C0 ratio of 0.50 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 90 mm outside diameter the fatigue load limit Cur is 23.6 kN, the limiting speed 6,600 r/min and the thermal reference speed 4,250 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 0.97 kN/mm and per millimetre of width 2.27 kN/mm — the reason 30 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 499 g, just 0.18 g per mm² of projected 90×30 mm envelope, which keeps unbalanced forces low in fast-actuating linkages at 70 mm bore the 90 mm outside diameter and 30 mm width target rolling stands, construction machinery and heavy gearboxes; the limiting speed drops to 6,600 r/min With no ribs the rollers can be arranged very freely in the 30 mm width, giving C 68 kN at only 90 mm outside diameter — the most compact radial unit in the HR1 needle section -XL means this is an X-life bearing — Schaeffler's upgraded performance level with smoother raceways, so the 68 kN C rating and longer nominal life come without an envelope change. Typical applications include connecting-rod small ends, textile machine heald and cam shafts and motorcycle and light-vehicle transmissions, where the 90 mm outside diameter and 68 kN dynamic rating match the duty. In connecting-rod small ends the unit fits a compact 70 mm seat, and in textile machine heald and cam shafts the 499 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for motorcycle and light-vehicle transmissions, relying on the 30 mm width and the published 135 kN static rating. Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways. Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO.

Typical equipment & failure modes

Selection pitfalls — read before you substitute

• Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways.
• Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO.
• Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations.